Improvement in harvester--gearings



1. Ff. SEIBERLING.

Harvester Gearing.

Patented 0'ct.19,1875.

WIT/VESSES l Attorney N. PETERS. PHOTOLITHOGRAPNER. WASHINGTON, D CV NITED 'STATES PATEN'I OFFICE;

f JOHN F. sEIBEnLING, OF AKRON, OHIO.

IMPROVEMENT IN HARVESTER ,GEARIN(:`|S".y

Specification forming part of Letters Patent No. 168,930, vdated October 19, 1875; application filed` April '7, 1874.

To all whom it may concern:

Be it known that I, JOHN F. SEIBERLING, of Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements vin Harvester-Gearing, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings making part of this specification, and in Which- Figurel is a plan view ofso much of a harvester to which my improvement is applied as is necessary to illustrate the inventionhereinafter claimed, the cover of the gear-casing being lifted to show the gearing. Fig. 2 represents a vertical section through the ma-.

chine, on the line .fr x of Fig. l.

The invention herein claimed .relates to the gearing of a harvester; and its object is to diminish the number of wheels and journals here# tofore deemed necessary to obtain the requisite rapidity of reciprocation of the cutters, as well'as to lessen the space occupied by the gearing and its inclosin g casin g. The subjectmatter claimed ishereinafter specilied.

Two driving-Wheels, A A', are mounted loosely on an axle, B, with which they are connected by suitable backing ratchets. This axle turns freely in boxes c c1, forming part of a cast-iron main frame, C, of such shape as to form part of a trough-shaped casing, C', in

which that part of the gearing below the axle is inclosed, its upper part being likewise protected by a cover, C2, hinged at c2, so as to allow it to be lifted when required. Two spurwheels, G G', of equal diameter, are arranged4 side by side on and turn with the main axle B, but with the teeth of one wheel opposite the spaces between the teeth of the other, as shown, instead of having the teeth in parallel planes transverse to the face of the wl1eel,.as

has heretofore been usual in this class ot gearing. These wheels,`in fact, constitute 'out one gear, being secured together or cast in one piece, and they are mounted loosely on the axle, to which they are locked, when desired, by a clutch, h, of well-known form, provided y-with a suitable shipping-lever. 'These spurwheels gear into corresponding pinlons .t t',

likewise con stitutin gone gear only, and mounted loosely on a ixed axle, I, mounted 1n the casing C1, and carrying a bevel-wheel, I', which turns loosely on the axle with these pinions, and drives a corresponding pinion, j, on a crank-shaft, J, which is also mounted in bearings in the casing C1, projects through a tubular boss, G3, on the front of the main frame, and drives the cutters by a crank and pitman. This arrangement of gearing Works very steadily,-"=with apparently no backlash, and very little noise; it requires much less power than ordinary gearing with a single set of teeth and the same pitch; it permits the gearing to be greatly reduced in size, so that it can easily be inclosed in a case of practicable size, and still retain the proper motion, without the necessity of addinganother set of gears to reduce the size of the wheels, as has been the case heretofore in inclosed-gear machines'having ordinary gearing. It will be observed that this gearing operates on the same principle as a gear with a single set of teeth, the teeth being only onehalf the size of their pitch, which has the effect of causing the resistance of the teeth at the pitch-line to be produced more directly on a line between the center of the wheel and pinion, thus causing more direct leverage on the pinion, thereby permitting the same to be much smaller than in ordinary gearing of a single set of teeth. v

It will be seen that by reducing the pinion, the large wheel cau be correspondingly reduced, and thus contract the size ofthe gearing in a double-geared machine, so that it can be inclosed in a small case, and save the extra expense, complication, wear, Weight, and heavy draft of a triple gear, while obtaining the same speed. j l

As the driving-wheel of a harvester seldom exceeds thirty-two inches in diameter, the distance between the axis of the driving-shaft andthe ground is only about sixteen inches. When the diameter of the driving-shaft and the distance which the gear-casing must run above the surface of the ground to avoid obstructions is deducted, there is practically only about twelve inches left for the diameter of the gear-casing.

By my invention I am enabled to reduce the diameter of the gears sol much as to dispense with one shaft and its bearings and two gears, thus diminishing the complexity, cost,

friction, and wear of the gearing. I have also found, in practice, that I can use a-pinion with a less number ot'- teeth than has heretofore been deemed practicable in harvester-gearing.

I am also enabled to use a gear-casing of less than one-half the diameter of the drivingwheel, and still attain theyrequisite speed of the cutters. In practice I use driving-wheels thirtyinch'es in diameter, a spur-wheel of about twelve inches in diameter, and a bevel-wheel of about eight inches in diameter. The vertical depth required below the axle is about half the diameter of the spur-wheel.

In a harvester, I claim- The combination of the spur-wheel, with its two sets of teeth alternately and intermittently arranged on its periphery with respect each to the other, the correspondingly-constructed 'spur-pinion, the bevel-wheel onthe same shaft,

and turning with the pinion, and the bevelwheel on the crank-shaft, crossing the line of the main axle, these several members being arranged, as described, within the inclosing case, and operating in combination, substani tially as set forth, to drive harvester-cutters.

In testimony whereof` I have hereunto subscribed my name.

JOHN F. SEIBERLING.

Witnesses: l 4

B. H. MORSE, E. C. DAVIDSON. 

